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Method for preparing pressure-sensitive material based on carbonized sponge

A technology of sensitive materials and sponges, applied in sensors, medical science, diagnosis, etc., can solve problems such as unfavorable industrial production and application, difficulty in obtaining raw materials, complicated preparation process, etc., and achieve sufficient raw materials, good flexibility, and simple preparation process Effect

Inactive Publication Date: 2017-06-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, flexible pressure sensors are mostly piezoresistive sensors, and their pressure-sensitive materials are mainly one-dimensional or two-dimensional nano-conductive materials, such as gold and silver nanowires, carbon nanotubes and graphene, etc. Resistive sensors have high sensitivity, but at present, nanomaterials such as gold and silver nanowires, carbon nanotubes or graphene generally have disadvantages such as complex preparation process, difficulty in obtaining raw materials, and high cost, which is not conducive to large-scale industrial production and application

Method used

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  • Method for preparing pressure-sensitive material based on carbonized sponge
  • Method for preparing pressure-sensitive material based on carbonized sponge
  • Method for preparing pressure-sensitive material based on carbonized sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ①The melamine sponge was thermally decomposed under the protection of nitrogen at a high temperature of 800°C for 1 hour to obtain carbonized sponge A. ② Connect the two ends of the carbonized sponge A prepared in step ① to the metal copper foil with conductive glue, respectively, as electrodes.

[0026] ③ Pouring 50% polydimethylsiloxane resin by volume into the carbonized sponge A connected with the copper foil electrode in step ②, vacuum degassing, and curing the resin to obtain the pressure-sensitive material.

[0027] figure 1 Schematic diagram of the working principle of the carbonized sponge-based pressure-sensitive material prepared for the present invention, wherein a) represents the state of the carbonized fiber when there is no pressure; b) represents the state where the carbonized fiber of the flexible pressure-sensitive material is broken under pressure. figure 2 It is the SEM photo of the prepared carbonized sponge. It can be seen from the figure that th...

Embodiment 2

[0029] ① Under the protection of argon, thermally decompose the melamine sponge at a high temperature of 700°C for 5 hours to obtain carbonized sponge B. ② Connect the two ends of the carbonized sponge B prepared in step ① to the metal aluminum foil with conductive glue, as electrodes.

[0030] ③ Pouring 20% ​​polydiethylsiloxane resin by volume into the carbonized sponge B connected with the aluminum foil electrode in step ②, vacuum degassing, and curing the resin to obtain the pressure-sensitive material.

[0031] The electrical conductivity of the carbonized sponge B prepared by using the method provided by the present invention is 0.004S / m. The prepared pressure-sensitive material has good flexibility and can be bent at any angle. The pressure-sensitive material has a good response to pressure changes, and the pressure sensitivity coefficient is 16.78.

Embodiment 3

[0033] ① Under the protection of helium, thermally decompose the melamine sponge at a high temperature of 1000°C for 0.5 hours to obtain carbonized sponge C.

[0034] ② Connect the two ends of the carbonized sponge C prepared in step ① to the metal aluminum wire with conductive glue, and use it as an electrode.

[0035] ③ Pouring 100% volume polymethylvinylsiloxane resin into the carbonized sponge C connected with the aluminum wire electrode in step ②, vacuum degassing, and curing the resin to obtain the pressure sensitive material.

[0036] The electrical conductivity of the carbonized sponge C prepared by using the method provided by the present invention is 1.599 S / m. The prepared pressure-sensitive material has good flexibility and can be bent at any angle. The pressure-sensitive material has a good response to pressure changes, and the pressure sensitivity coefficient is 12.20.

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Abstract

The invention provides a method for preparing a pressure-sensitive material based on a carbonized sponge. The method comprises the following steps that 1, a melamine sponge is subjected to thermal decomposition treatment for 0.5-5 hours at the high temperature of 700 DEG C to 1,000 DEG C under vacuum or inert atmosphere protection, and the carbonized sponge is prepared; 2, resin materials with the volume 0.2-1 time that of the carbonized sponge are poured into the carbonized sponge, vacuum defoaming is carried out, and after resin is cured, the pressure-sensitive material with high sensitivity is obtained. The method has the advantages that raw material sources are cheap, high repeatability is achieved, the preparation process is simple and controllable, the prepared pressure-sensitive material is wide in stress range and high in sensitivity, and the method has good application prospects on the aspects of structure health monitoring, electronic skin, biological medicine, wearable electronic products and the like.

Description

technical field [0001] The invention relates to a preparation method of a pressure-sensitive material, more specifically, the invention relates to a preparation method of a carbonized sponge-based pressure-sensitive material, which can be used as a core element of a flexible pressure sensor. Background technique [0002] Sensors are widely used in aerospace, military industry, transportation, construction, medical health and other fields. In recent years, with the development of various smart wearable devices, sensors can be used to realize human perception functions such as touch, smell, taste, hearing, and vision, and their applications in human health detection, medical treatment, and motion tracking have become increasingly important. Traditional pressure sensors such as electrical resistance strain gauges and semiconductor strain gauges have shortcomings such as low sensitivity coefficient and poor flexibility, which make it difficult to meet the requirements of the new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0205A61B5/11
CPCA61B5/02A61B5/0205A61B5/08A61B5/11
Inventor 李元庆余晓光黄培付绍云
Owner CHONGQING UNIV
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